package com.wf.demo.sys.filter;


import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.wf.demo.sys.constant.CommonConstant;
import com.wf.demo.sys.util.JwtToken;
import lombok.extern.slf4j.Slf4j;
import org.apache.shiro.web.filter.authc.BasicHttpAuthenticationFilter;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 鉴权登录拦截器
 **/
@Slf4j
public class JwtFilter extends BasicHttpAuthenticationFilter {

    /**
     * 执行登录认证
     *
     * @param request
     * @param response
     * @param mappedValue
     * @return
     */
    @Override
    protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) {
        try {
            executeLogin(request, response);
            return true;
        } catch (Exception e) {
      //  throw new AuthenticationException("Token失效请重新登录");
            try {
                response.setCharacterEncoding("UTF-8");
                response.setContentType("application/json; charset=utf-8");
                JSONObject res = new JSONObject();
                res.put("code", -3);
                res.put("message", "登录已失效，请重新登录！");
                res.put("data",null);
               // Result r=Result.error(-5,"登录已失效，请重新登录！");
                response.getWriter().print(JSONObject.toJSONString(res,SerializerFeature.WriteMapNullValue) );
            } catch (IOException ex) {
                ex.printStackTrace();
            }
           return  false;
        }
    }
    /**
     *
     */
    @Override
    protected boolean executeLogin(ServletRequest request, ServletResponse response) throws Exception {
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        String token = httpServletRequest.getHeader(CommonConstant.ACCESS_TOKEN);//ACCESS_TOKEN = "Access-Token";

       JwtToken jwtToken = new JwtToken(token);
        // 提交给realm进行登入，如果错误他会抛出异常并被捕获
        getSubject(request, response).login(jwtToken);
        // 如果没有抛出异常则代表登入成功，返回true
        return true;


    }

    /**
     * 对跨域提供支持
     */
    @Override
    protected boolean preHandle(ServletRequest request, ServletResponse response) throws Exception {
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        HttpServletResponse httpServletResponse = (HttpServletResponse) response;
        httpServletResponse.setHeader("Access-control-Allow-Origin", httpServletRequest.getHeader("Origin"));
        httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS,PUT,DELETE");
        httpServletResponse.setHeader("Access-Control-Allow-Headers", httpServletRequest.getHeader("Access-Control-Request-Headers"));
        // 跨域时会首先发送一个option请求，这里我们给option请求直接返回正常状态
        if (httpServletRequest.getMethod().equals(RequestMethod.OPTIONS.name())) {
            httpServletResponse.setStatus(HttpStatus.OK.value());
            return false;
        }
        return super.preHandle(request, response);
    }
}

